package com.ma.imserver.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextHolder implements ApplicationContextAware {
    private static ApplicationContext applicationContext;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextHolder.applicationContext = applicationContext;
    }
    public static ApplicationContext getApplicationContext(){
        asserApplicationContext();
        return applicationContext;
    }
    public static <T> T getBean(String beanName){
        asserApplicationContext();
        return (T) applicationContext.getBean(beanName);
    }
    public static <T> T getBean(Class<T> requiredType){
        asserApplicationContext();
        return applicationContext.getBean(requiredType);
    }
    private static void asserApplicationContext(){
        if (SpringContextHolder.applicationContext == null){
            throw new RuntimeException("applicationContext属性为null，请检查是否注入了springContextHolder！ ");
        }
    }
}
